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  1. #1
    PWCToday Newbie
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    Nevada
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    2005 stx 12f wide open throttle-is this bad?

    I tried search, but found no answer so i apologize. Bought 2 of these skis, first time owner. will i damage the engine at wide open throttle? they have about +- 140 hours on them, and seem to run good.

  2. #2
    PWCToday.com Is My Home Away From Home hyosung's Avatar
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    Aug 2010
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    Re: 2005 stx 12f wide open throttle-is this bad?

    replace the fuel filter !plugs are probably bad as well ,being a four stroke ski they should be regularly serviced as you would with a car , motorcycle , etc , on a side note , check the fuel filler neck is not cracked , this id a common fault with those skis and it allows water to enter the fuel tank , great choice of ski they are very robust and reliable
    Last edited by hyosung; 06-29-2017 at 01:35 PM.
    2 x 650 sx custom build (my toys) http://www.pwctoday.com/showthread.php?t=425767

    modded X2 650

    stock looking ZXI 900 ""being cannibalized to sponsor a 650 sx build """

    Jerry Rigging is my specialty .....


    Originally Posted by hyosung
    so when you say i """ hammer and slap things together """ this may be so , BUT they are hammered and slapped together SOLID

  3. #3
    PWCToday Newbie
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    Re: 2005 stx 12f wide open throttle-is this bad?

    okay, i need to order the service manual.

  4. #4
    PWCToday Regular
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    Re: 2005 stx 12f wide open throttle-is this bad?

    Quote Originally Posted by Gsl.shoemaker View Post
    I tried search, but found no answer so i apologize. Bought 2 of these skis, first time owner. will i damage the engine at wide open throttle? they have about +- 140 hours on them, and seem to run good.
    I have the same ski, it's a very robust motor and I can run WOT all I want.
    Make sure it's running good (very sensitive to old plugs) and fresh oil, etc.....
    Regards
    charger_john
    in Kent, WA.
    1996 JS750SXI (sold in 2017!), 2004 STX-12F, 2015 Superjet

  5. #5
    PWCToday Newbie
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    Re: 2005 stx 12f wide open throttle-is this bad?

    thx john

  6. #6
    PWCToday Newbie OR Biomed's Avatar
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    Re: 2005 stx 12f wide open throttle-is this bad?

    I am the 3rd owner of a 2003 stx 12f. Bought it with 50, it now has 345hrs on the clock. I run mine wide open all the time. If it starts to hesitate on RPMs replace the plugs. They are very touchy on plugs. Solid unit if its taken care of.

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